I have two 4 month old Aussie pullets and two 1 month old Bantam Mille Fleur D'Uccle's pullets. How can I introduce them without the Aussies bullying them. Someone said to wait until they are big enough to defend themselves but they will never be big. They are still in the brooder but I've been letting them free range in a pen on days that are warm. I only have one coop so permanent segregation isn't an option. Ideas? Also I have two Buff Orpington pullets that will be here next week from the hatchery, any thoughts on that? This is my first time to have chickens so any and all advice would be helpful.